北京师范大学学报（自然科学版）2016，Vol.52Issue(3)：311-316,6.DOI:10.16360/j.cnki.jbnuns.2016.03.010
冻土退化过程中植被覆盖度的变化研究
Vegetation responses to permafrost degradation in the Qinghai-Tibetan Plateau
摘要
Abstract
Due to global warming,permafrost in the Qinghai-Tibetan Plateau degenerates continuously. Permafrost degradation has weakened or even taken away the impermeable effect,leading to changes in plants on suprapermafrost water.The distribution of permafrost in the Qinghai-Tibetan Plateau was simulated,and changes in vegetation coverage during permafrost degradation were analyzed.Permafrost changes could be divided into three phases:stabilization (1980s),fast degradation (1990s),slow degradation (last decade). Variation in slope coefficient of vegetation coverage in the Qinghai-Tibetan Plateau was analyzed with 3rd NDVI data (1982—2012)of GIMMS (global inventory monitoring and modeling studies).Slope coefficient of vegetation coverage in the Qinghai-Tibetan Plateau was found to increase slightly in the last 31 years.The area with increased coverage occupies 57% of the entire region,except for the degradation trend in southeast or in Qaida basin.Variation in vegetation coverage in 3 phases of permafrost degradation is as follows.In the 1980s, permafrost was relatively steady,only 30% of vegetation was in degraded state.Forty one percent (41%)of vegetation coverage (11% more than that in the 1980s)is in degraded state,when temperature increased universally and permafrost depredated in large scale in the 1990s.In the recent decade,permafrost degradation has gradually slowed down.The spread of vegetation degradation has also weakened,with an area of 3% more than in the 1990s,the areas have also become more concentrated.The mechanism of change in permafrost and vegetation degradation is complicated.Analysis and discovery in this study are significance for understanding permafrost impact on ecological system.关键词
青藏高原/冻土退化/植被/斜率Key words
Qinghai-Tibetan Plateau/permafrost degradation/vegetation/slope分类
天文与地球科学引用本文复制引用
冯雨晴,梁四海,吴青柏,陈建伟,田鑫,吴盼..冻土退化过程中植被覆盖度的变化研究[J].北京师范大学学报（自然科学版）,2016,52(3):311-316,6.基金项目
国家自然科学基金资助项目(41330634,91125011,41072191) （41330634,91125011,41072191）
中央高校基本科研专项基金资助项目 （）
